I'm FIXED. And my thanks to Tara, Tammy, Autrice, and AscenderRising for sending your suggestions for assistance. Lord, I hope I did not forget anyone. It is much appreciated. Here is what happened and I pass this along in case you find yourself faced with the same problem.
I noticed that the sidebar problem started at a particular entry so I went into that post (in this case it was the book recommendation post). I looked through all the html tags and nothing seemed out of place but then I realized that instead of connecting the book title with a link, I simple pasted the link into the body of the text. So, I cut the website address from the body of the post and linked it using the icon in the message bar. Problem solved.
Since this problem started on a Friday, I will post this now as a Grateful Friday entry. I am grateful that this happened because it lead me to start backing up all my post since March. I'm copying them into a word document that will be used in a few months (after much editing) to become Volume One of Memories that I will give to my children at Christmas every year. I hope to be doing this blog for many decades to come and my children will have a tangible reminder of me, their parents, their family, and their life.
Thanks again to all,